/*
 * Copyright 2002-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package qunar.tc.bistoury.instrument.client.spring.el;


/**
 * Internal utilities for the conversion package.
 *
 * @author Keith Donald
 * @since 3.0
 */
abstract class ConversionUtils {

    public static Object invokeConverter(GenericConverter converter, Object source, TypeDescriptor sourceType,
                                         TypeDescriptor targetType) {
        try {
            return converter.convert(source, sourceType, targetType);
        } catch (ConversionFailedException ex) {
            throw ex;
        } catch (Exception ex) {
            throw new ConversionFailedException(sourceType, targetType, source, ex);
        }
    }

    public static boolean canConvertElements(TypeDescriptor sourceElementType, TypeDescriptor targetElementType, ConversionService conversionService) {
        if (targetElementType == null) {
            // yes
            return true;
        }
        if (sourceElementType == null) {
            // maybe
            return true;
        }
        if (conversionService.canConvert(sourceElementType, targetElementType)) {
            // yes
            return true;
        } else if (sourceElementType.getType().isAssignableFrom(targetElementType.getType())) {
            // maybe;
            return true;
        } else {
            // no;
            return false;
        }
    }

}
